The Las Vegas UNITE HERE Culinary and Bartenders Unions announced Wednesday that they will hold a strike vote on May 22, allowing their members to cast votes on whether they should go out on strike if they fail to negotiate better working conditions with their employers.

The contracts of about 50,000 union members are set to expire on June 1, 2018. They are all working at 34 Downtown Las Vegas and Strip casino resorts. Most of these properties are operated by gaming and hospitality giants Caesars Entertainment Corp. and MGM Resorts International. Other companies that will be affected by a potential strike include Boyd Gaming, Golden Entertainment, and Penn National.